It was all out war at Katherine Jackson's house in Calabasas Monday ... complete with slapping and punching ... TMZ has learned.

We now have details about the incident. Sources who were there say two SUVs with Randy, Jermaine and Janet inside, followed a car driving Michael Jackson's 3 kids inside the gates. We're told Randy, Jermaine and Janet did not have authority to enter.

Once on the grounds, we're told MJ's 3 siblings tried to strong-arm Paris, Prince and Blanket. Their mission was to get them in an SUV and take them to Arizona, where Katherine has been staying.

Our sources say at one point Janet tried to grab a resistant Paris' cell phone, a scuffle ensued and Janet slapped the teenager, screaming, "You're a spoiled little bitch!" We're told Paris fired back with her own slap and told Janet, "This is our house. Not the Jackson family house. Get the f**k out!"

At the same time, we're told Trent Jackson, who was at the house, tried to stop an aggressive Randy and Jermaine. We're told Trent put Randy in a headlock and punched Jermaine in the mouth.

Tito Jackson is backing out of the plot to turn Katherine Jackson against the Michael Jackson Estate ... he tells TMZ he wants nothing to do with it.

Tito says, "I completely retract my signature from the July 17th letter sent to the Executors of my brother Michael's estate and repudiate all the claims made against them."

He adds, "I don't want any part of that letter whatsoever."

The letter Tito is referencing was signed by Jermaine, Janet, Rebbie and Randy ... and accused the executors of failing at their job and stressing out their mother, Katherine Jackson, so badly that she suffered a "mini-stroke."

We broke the story ... Tito's son, TJ, is preparing legal docs so he can ask a judge to become the temporary guardian of Michael's 3 kids.

We're also told Jackie is having second thoughts about the plot to overthrow the Estate.

Randy Jackson just came out swinging against the people in charge of the Michael Jackson Estate -- claiming the executors are "criminals" who falsified documents for their own personal gain ... but it's looking like Randy's plot is quickly crashing and burning.

Jackson just spoke with Al Sharpton on MSNBC's "Politics Nation" ... and tried to explain why he and his siblings are trying to overthrow John Branca and John McClain.

"We feel there is criminal misconduct," Jackson said ... claiming the executors had a hand in faking MJ's will ... and Randy believes he can prove it because Michael was in NY on the day he supposedly signed the document in L.A.

Problem is ... Randy's argument has a GIANT flaw ... the "mistake" he's pointing to is based on a witness who merely forgot what city he was in at the time the will was signed.

There are witnesses who saw MJ sign the will ... and it has been validated by the court.

But even if Randy and his siblings were to get the will invalidated ... MJ's old will cuts them out of MJ's fortune too ... and it appoints Branca executor.

Multiple sources tell TMZ ... the situation is simply a money grab by MJ's siblings who know that once Katherine Jackson dies ... MJ's money goes in trusts for his kids. Randy and co. will never get a dime.

Randy kept saying they are a family. Paris begs to differ, because she just tweeted, "'Family' they said." Can you feel the sarcasm? And apparently Randy hasn't read our website ... that Tito has already jumped the "family" ship.

Katherine has been holed up in Arizona for the past 10 days ... after she was effectively kidnapped by Randy and several other Jackson siblings in what appears to be a scheme to pressure Katherine to try and overthrow the executors of the Michael Jackson estate.

But moments ago, Randy -- the family ringleader -- appeared on "Good Morning America" ... and announced his mother was finally coming home ... just one day after Tito BAILED on the plot.

It's unclear if this will affect TJ Jackson's plan to seek temporary guardianship of MJ's kids.

Lawyers for TJ Jackson are at an L.A. courthouse right now in an attempt to get temporary guardianship of Michael Jackson's three kids ... TMZ has learned.

We broke the story ... TJ -- Tito's 34-year-old married son -- has been acting like a quasi-parent to Paris, Prince, and Blanket.

TJ is basing his bid on the fact that Katherine Jackson has been MIA and not providing proper supervision of the kids.

As we reported, Michael's three kids all love TJ and want him to become their temporary guardian.

In addition, lawyers for the Michael Jackson estate are in court and will support TJ's bid to become temporary guardian.

We're told Katherine's lawyers will also be appearing in court to provide specific never-before-heard details about Katherine's disappearance ... details that will affect TJ's bid for guardianship.

9:35 AM PT -- TJ has just arrived at the courthouse along with an army of lawyers -- his lawyer, the kids' lawyer, lawyers for the MJ estate, and lawyers for Katherine. Talk about one expensive hearing.

A judge just appointed TJ the temporary guardian of Michael Jackson's three kids and suspended Katherine Jackson's guardianship.

There's a reason TJ Jackson had a lawyer prepare legal papers to make him the temporary guardian of Michael Jackson's kids -- he has already partially assumed that role ... and he even has the Kim Kardashian stamp of approval.

TMZ broke the story ... TJ became alarmed when Katherine Jackson -- the current legal guardian -- disappeared for more than a week.

Jackson sources tell us ... TJ -- the 34-year-old married son of Tito -- has had a strong connection to Paris, Prince and Blanket for years, but was especially comforting after MJ died.

One example ... at the Michael Jackson tribute show in Wales, Katherine was by herself in a private area, far from the kids. TJ was in full dad mode, helping Blanket tie his shoes, helping Prince tie his tie. He made sure the kids were fed during the concert, which lasted for hours.

Kim Kardashian, who dated TJ for 4 years, tells friends, of all the Jacksons ... TJ was the closest to Michael and his kids. She says TJ had a "father-like" relationship with Michael's kids, adding, "He's a very honest and trustworthy person and everyone knows he'll do the right thing."

Paris, Prince and Blanket adore TJ and are behind the temp guardianship move, and that's something that will weigh heavily with the probate judge.

We're told TJ is in wait mode -- to see what happens with Katherine. But the papers are drafted and he's ready to make his move in court.

Katherine Jackson has been temporarily stripped of her guardianship over Michael Jackson's 3 kids, and an L.A. judge just appointed Tito Jackson's son TJ to become the temporary guardian.

And there's more ... Judge Mitch Beckloff advised TJ and his lawyer, Charles Shultz, to seek a permanent guardianship, after hearing stories that Katherine may have been held against her will "from third parties." Translation -- Randy, Janet, Jermaine and Rebbie.

Before handing down the ruling, TJ's lawyer told the judge TJ got a strange phone call from Katherine yesterday. TJ said, "I've never heard my grandmother talk like that." TJ added, "She wasn't sharp. The pauses, choice of vocabulary ... she has not used certain phrases like that before." TJ thought she was talking in code. TJ choked up as he addressed the court.

TMZ broke the story that TJ would make this move -- a move supported by Paris, Prince, and Blanket, as well as the Michael Jackson Estate.

The judge said Katherine was not suspended for wrongdoing, but that she was prevented from doing her guardianship by the third parties who are clearly Randy, Janet, Jermaine and Rebbie.

Katherine's lawyer, Sandra Ribera, added that she (Sandra) has been to the house several times recently and believes Katherine has been held against her will.

Katherine's lawyer, Perry Sanders, says he would vigorously oppose any move to permanently strip Katherine of her guardianship duties.

Perry also says ... when Katherine returns to L.A., he will file a motion to reinstate her as guardian

Because no Jackson family drama is complete without Papa Joe ... Katherine's estranged husband has finally come to town ... and moments ago, he arrived to the family's famous home in Encino, CA.

It's the first time we've seen Joe Jackson since Katherine was reported missing over the weekend.

Joe -- who spends most of his time in Vegas and rarely comes to L.A. -- pulled up at the Jackson compound roughly 30 minutes ago in a black Mercedes with Nevada plates, wearing his trademark fedora. We're told he checked the mail and disappeared into the home.

Katherine is currently on her way back to L.A.

No word on how long Joe plans to stay in town ... or if he plans to meet up with the family to try and end the drama.

Katherine Jackson called her home in Calabasas at 2 AM today and again at 4 AM, sounding "drugged" and ordering that the security team be fired and replaced by Janet Jackson's security ... TMZ has learned.

A lawyer in court today made reference to "an incident" last night -- this is the incident. Sources involved in the situation tell TMZ ... people in the house were "alarmed and nervous" after hearing Katherine sounding heavily drugged.

In addition to attempting to 86 the security team, Katherine ordered Trent Jackson off the property. You may recall, Jackson's security -- and Trent in particular -- thwarted Monday's attempt by Randy, Jermaine and Janet to take the kids to Arizona.

Our sources say the prevailing view is that Randy and company have drugged their mom.

We're also told Jackie Jackson is furious at his conspiratorial siblings for what they've done and what they are trying to do.

We were unable to get Randy for comment.

Katherine's lawyer, Perry Sanders, tells TMZ ... "I'm waiting on Katherine to get back in town and I'm looking forward to getting a hold of her to ascertain what's been going on."

2:43 PM PT -- Randy Jackson has gone to Twitter ... claiming Katherine fired Trent and her security team at 9 PM last night ... NOT between 2AM and 4AM this morning.

He makes no reference to allegations she was "drugged up" during the phone call ... but Randy does say he was on the phone with Rebbie when it all went down.

Randy also claims TJ had ASKED Katherine for temporary guardianship last night ... but Katherine flat out turned him down ... saying, "NO TJ."

Katherine Jackson has finally broken her silence ... claiming the reason she hasn't checked in with her grandkids for the past 10 days is because she simply didn't feel like using the phone.

She also sounds like she's full of crap.

Jackson just finished up an on-camera interview with "ABC News" ... and talked about the family drama that's transpired since she mysteriously ditched MJ's kids 10 days ago ... and wound up in Arizona.

"There are rumors going around about me that I have been kidnapped," Jackson said ... adding, "I am here today to let everybody to know that I am good and fine."

"My children would never do anything to me like that."

Sure they wouldn't ...

When asked why she felt it was OK to leave 3 minor children in a house without a guardian .. Katherine explained she just felt like taking a "short vacation."

"One reason I didn't call is I just gave up my phone and I didn't want to have any phone calls while I was here."

It's unclear why she didn't TELL HER GRANDKIDS FIRST!

Still, Katherine says ... "I am devastated that while I've been away, my grandchildren have been taken away from me, and I'm coming home."

TJ filed the docs with the court before today's hearing -- and in the papers, TJ claims Katherine was being manipulated by family members who were hellbent on controlling Katherine.

In fact, TJ claims one of his aunts -- either Janet or Rebbie -- arranged for a person to IMPERSONATE A DOCTOR to convince Katherine to blow off a concert series and instead fly with her conspiratorial children to Arizona.

TJ claims he had been assisting with the care of MJ's children since MJ died ... and even before Katherine disappeared, she placed them in his care.

According to the docs, TJ claims he finally spoke with Katherine on July 24 -- and during the conversation, she "indicated to me that she supported me in taking steps that I deemed appropriate to protect [MJ's children]."

TJ was eventually awarded temporary guardianship over Paris, Prince and Blanket.

After the hearing, Katherine contradicted TJ's story ... insisting she was "devastated" by the court's decision.

Katherine Jackson is challenging the court ruling that temporarily stripped her of guardianship of Michael Jackson's children -- and claiming she never wanted TJ Jackson to step into the role ... despite court documents stating otherwise.

In a taped segment for ABC's "Nightline" ... Katherine read prepared comments from a notebook, and said -- "Their ruling in court today was about the guardianship, and I think it was based on a bunch of lies. But I have a good idea who's doing that ... who's behind it."

Katherine went on to say she spoke to TJ last night and "told him it wasn't necessary for him to go down and sign up for guardianship, but I don't know who instructed him to do that ... 'cause he wanted me to come home before that happened."It's a strange statement because Katherine seems to be acknowledging she knew TJ was going to file for guardianship ... but not before she got home.In fact, as we reported earlier, TJ stated in court docs that Katherine "supported" him taking steps to protect Michael's kids.

The whole TV segment seemed almost like a hostage situation as Katherine was surrounded by Janet, Jermaine, Rebbie, Rebbie's daughter and, for some reason, the marketing director for the Tucson spa where Katherine's been for more than a week. A local news reporter was in the room, but was not allowed to ask questions.

As for leaving Prince, Paris, and Blanket alone in L.A. -- Katherine claimed she left instructions about who was to take care of them while she was gone ... though she didn't name anyone specifically.

The 82-year old also said during her absence her assistant had been keeping in touch with her grandchildren -- and that she didn't personally call "because I just gave up my phone. I didn't want to have any phone calls."

The plot to turn Katherine Jackson against the Michael Jackson Estate has backfired in the most ironic of ways ... because the money grab could end up costing Katherine millions in perks.

When Katherine was appointed guardian of Paris, Prince and Blanket, the Executors gave an allowance of $60,000 per month for the care of the children ... that's $720,000 a year. Less than a year later the judge increased the 60k to 70k, and that would make the yearly take $840,000.

The judge is now in position to strip Katherine of guardianship altogether. If that happens, the executors will almost certainly petition the court to funnel the money in TJ's direction, since he would be caring for the children.

Katherine never had control of the money for the kids, but she enjoys a lot of the perks the kids get, and that goes away if she loses guardianship. She would still, of course, retain the allowance he personally receives from the Estate.

Short story ... Randy, Jermaine, Janet and Rebbie set out to turn Katherine against the estate so she could get more money during her lifetime -- money she could dole out to them -- but the plot may have actually screwed Katherine.

Michael Jackson's eldest child is putting his relatives on blast -- particularly Janet Jackson -- by posting what he claims is an angry group text message convo about his grandmother Katherine Jackson.

Katherine returned from Arizona late last night, but a few hours later Prince Jackson sent out a tweet that included the text message, dated July 23rd (Monday). In it Prince says, "This is enough so I am texting you for the simple fact that WE DEMAND TO SPEAK TO MY GRANDMA NOW!!!"

A reply from "Janet Jackson" reads ... "Don't let them pls." It appears the message continued, but Prince did not post the rest of it.

In his tweet Prince also says, "Although I am happy my grandma was returned, after speaking with her I realized how misguided and how badly she was lied to. I’m really angry and hurt."

He continues, "For this whole time, they denied us contact to our grandmother. If you continue with your lies I will continue with the truth.”

Prince added a reference to his father -- "As long as I can remember my dad had repeatedly warned me of certain people and their ways."

11:20AM PT Prince has deleted the tweet ... including the screen grab of the text message.

Katherine Jackson had FULL ACCESS to a working phone during her stay in Arizona and could easily have called her grandkids whenever she wanted ... so says a rep for the resort.

A spokesperson for the Miraval Resort -- where Katherine stayed for nine days, beginning last week -- tells TMZ, Katherine stayed in a luxury villa that DEFINITELY contained a working phone.

For the record ... the villa also came with a full kitchen, a private patio, its own pool ... and its own butler.

And if full phone access wasn't enough -- Katherine also had FREE WI-FI.

Bottom line ... the Miraval Resort is adamant ... Katherine wasn't as cut off from the outside world as she previously claimed.

After yesterday's court hearing, Katherine's lawyer was asked why she wasn't allowed to use a phone to call her grandkids -- and her lawyer said he was told "the section of the facility she stayed at didn't allow phones of any kind. Or computers."

Nothing brings the Jackson brothers together like a payday -- TMZ has learned, Jermaine, Tito, Marlon, and Jackie still plan to perform a concert together tomorrow night ... despite a war raging between Jermaine and the rest of his siblings.

As we reported, Tito, Marlon, and Jackie have drawn a line in the sand -- aligning themselves with the Michael Jackson estate ... while Randy and Jermaine continue to claim the estate is defrauding the family.

Now, sources close to the brothers tell TMZ, the Jackson Unity concert scheduled for tomorrow at the Mountain Winery in Saratoga, CA will still take place as scheduled.

According to sources, the brothers have decided to put their problems aside for the sake of the fans.